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In 2012, a phosphate green extended life coolant was used in the Mazda5, which is suitable for Asian vehicles. It is recommended to replace the engine coolant at either 100,000 miles or after ten years. Over time, the coolant loses its ability to prevent corrosion and provide lubrication. Old radiator coolant can lead to rust build-up, which can damage your car's radiator and engine. Warning signs that you should immediately flush your radiator include noticing coolant leaks under your car and hearing a grinding noise coming from the engine. Other indications of a malfunctioning cooling system include smelling antifreeze or the car overheating too easily.
The coolant recommended for the 2012 Mazda 5 as stated in the owner's manual is green extended life with phosphate organic acid technology, specifically designed for Asian vehicles.